Connecting arrangement for high-frequency telephony



April 13 1926. v

' C. SCHWARZ couuscrms ARRANGEMENT FOR HIGH FREQUENCY TELEPHONY Filed Oct. 31. 1921 w vs/vron 4 rromvsvs Patented Apr. 13,1926.

UNITED STATES 3 1,580,538 PA-TENT OFF-ICE.

CARL SCHWARZ, OF CHARLOTTENBURG, NEAR BERLIN, GERMANY, ASSIGNOR TO WESTINGHOUSE ELECTRIC 8r. MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

CONNECTING ARRANGEMENT For. HIGH-FREQUENCY TELEPHONY. l

Appication filed October 31, 1921- Serial No. 511,827.

To all whom itmay concern:

Be it known that I, CARL SCHWARZ, a citizen of the German Republic, residing at Charlottenburg, near Berlin, Germany, have invented certain new and usefulImprovements in Connecting Arrangements for High-Frequency Telephony, of which the following is a'specification. v s

This invention relates to radio sending 10 and receiving system of the type described in my copending application'511,828, filed Oct. 81, 1921. As stated in said co-pending application, certain circuit changes are made in order to prepareth-e sending and receiving apparatus for communication with one of a number of stations belonging to the same system. These circuit changes are brought about by relays whichare controlled by the actuation of the calling device orthe go lifting of the telephone receiver.

It is an object'of the invention described in this application to provide means where by actuation of the calling device or lifting the receiver shall produce the intended operation of the relays.

It-is a further object of this invention to associate such relay controlling means with relays that actuate proper circuit-controlling devices for producing the needed changes to prepare the station for communication with a selected station.

Other objects of this invention and details of the structure will be apparent from the following description and the accompanying drawing, wherein Figure 1 is a view, partly diagrammatic and partly'in perspective, illustrating the invention, and

Figure 2 is a fragmental view of a portion of the apparatus, illustrating a modification of the invention.

The sending device S and the receiving device E are not completely illustrated but are shown in a general way only, because the invention which is the subject of this application is not dependent upon the details of either the sending or the receivin device. The sending device includes a loa ing coil L8 which is connected to'the antenna and the ground. This connection is indicated by the terminals Ts. In normal condition of the apparatus at the illustrated station, the whole of the loading coil Ls is included 1n tore,

circuit. At other times, onlya portion of this coil should be thus included. 7 The necessary change in connections for reducing the part of the loading coil included in the circuit are accomplished by the relay Rs. At the same time, a change in the number of turns of the coil Lg included in the grid circuit is accomplished by the relay Rg.

The receiving instrument E is similarly arranged, having connections as shown at Te for the antenna and ground.- Ithas an inductance coil Le, in parallel with which is a capacity Ck or a capacity Cg.,'The change from one of these to the other is accomplished' by a switch controlled by the relay Re. In. inductive relation with the coil L6 is a coil for the grid circuit of the-receiving tubeVe. In parallellwith this coil there is a condenser K or Kg, and the change from one of these condensers to theother is controlled by the relay Re. 7

The relays Rg, Rs and Re are controlled by a circuit supplied by the battery B. In the form illustrated in Fig. 1, this circuit is controlled by the switch ,u. I This switch is held in open position by a spring and is actuated to closed position by a cam N upon a disk Du whichis mounted upon the operating shaft of the calling device A. In its normal position, the disk Du covers the operating disk D1, so that the calling device cannot. be actuated until after the disk Du has been moved. The operator, in making a call, first lifts the receiver H and then moves the disk Du to a position uncoveringthe disk Dr. IVhen the diskDu is moved, the cam N closes the switch a, and the tooth t passes behind the pawl Z. This pawl, thereholds the disk Du in a osition in which the cam N keeps the switchclosed. The operator then actuates the calling device by moving the disk Dr. When the conversation is finished, the operator replaces the receiver H which causes the support m, shown in dotted lines, to be depressed and so to move the pawl Z and thus release the disk Du. This enables the spring-actuated switch to return to open position. The relays, Ry, R8 and Re thereupon are deenergized and the connections return to normal condition so that the apparatus in the station is again adjusted to its normal wave length. 7

It is desirable, in some situations, to have the change of Wave length made at the receiving'station instead of the calling station, such situations are provided for by connections of the sort illustrated in Fig. 2. In this figure, the switch a is normally closed and, when it is moved by the calling device, it opens the circuit. On the other hand, if the calling device remains undisturbed but the operator lifts the receiver H, the pawl Z will cause the switch to to be closed which will close the circuit through the relays and produce the desired changes in wave length. Itis, therefore, obvious that, with this arrangement, manipulating the calling device produces'no effect upon the relays, because it only opens the circuit which is already open, but, if the receiver be lifted, this circuit is closed and the relays actuated.

It will-be obvious that other changes in the arrangement of the circuit-controlling switches can be provided to accommodate other situations. It will also be obvious that ch'angesin the connections by which the relays-producing the-changes in Wave length can be made Without difficulty. Although the illustration and specific description has beenmade foronly two forms of the invention, many changes in the details of construction may be madewithout departing from the spirit of the invention, I, therefore, do not intend the patent to be limited otherwise than is necessitated by the prior art or in dicated by the claims.

I claim 'as my invention:

1. I11 a signal-sending and receiving station', tuned circuits, means for changing the tuning of the circuits, relays operating said changing means, circuits operating said relays, a circuit-changing device for controlling said relays, a calling device, and automatic means for actuating said circuitchanging device upon the operation of the calling device.

2. In a signal-sending and receiving station, tuned circuits, means for changing the tuning thereof, a circuit controlling said changing means, a switch controlling said circuit, a calling device, a disk normally in position to prevent operation of said calling device, and means operated upon the movement of said disk for actuating said switch.

3.-In asignal-sending and receiving station, a telephone receiver, tuned' circuits, means for changing the tuning-thereof, a circuit controlling said changing means, a switch controlling said circuit, a calling de= vice, a dial for operating the calling device, adisk normally covering said dial, means movingwithsaid disk for actuating saidswitch when said disk uncovers said dial, a locking device for holding said diskin uncovering position, and means actuated by the weight of the telephone receiver, for movingsaid locking device to unlockposition.

a. In a signal-sending and receiving sta-' tion, a telephone receiver, tuned circuits, means for changing the tuning thereof, a circuit controlling said changing means, a switch controlling said circuit, a calling device, a' dial for operating the calling'device, a disk normallycovering said dial, means moving with said disk for actuatingsaid switch when said disk uncovers said dial,

a locking devicefor holding said disk in uncovering position, means actuated by the weight of the telephone receiver for moving said locking device to unlockposition, and an auxiliary switch controlled by said locking device and controlling the effect of the firstnamed switch.

In testimony whereof I aiiixmy signature.

CARL SOHVVARZ', 

